sedimentary
Jasper
Silicon dioxide (Quartz variety), SiO2
Hardness: 6.5-7 on the Mohs scale, Color: Brown, red, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz/chalcedony), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Brown, red, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz/chalcedony), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often replacing organic material or filling fractures.
Uses & applications
Used in ornamental objects, cabochons, jewelry, carvings, and as a collector's mineral specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry. Ancient civilizations like the Egyptians and Greeks valued it deeply.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and ancient sedimentary formations. Identified by its opacity, microcrystalline structure, conchoidal fracture, and rich earthy colors.
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